Rimuru becomes the new teacher for Shizu's students. However, having been summoned into this world against their will and facing shortened lifespans as a result, the children's feelings are complicated, and they're reluctant to accept Rimuru. So Rimuru proposes a series of mock battles with each of them to ascertain their abilities and allow them to let off steam.
And I must show my gratitude to 
my savior or incur Heaven's wrath!
ومن واجبي أن أظهر امتناني لمُنقذي وإلّا
أثرتُ غضب السّماء
Bei seinem Retter muss man sich
entsprechend bedanken. Sonst rächt sich das.
Debo ser agradecido con mi salvador
o me caerá la ira del cielo.
Debo ser agradecido con mi salvador
o me caerá la ira del cielo.
E devi sempre ringraziare colui 
che ti ha salvato la vita!
E devo mostrar toda a minha gratidão
a quem salvou minha vida,